The quality requirements of low-pressure casting processing mainly include casting surface roughness, size, shape, physical properties, mechanical properties, holes, cracks, wear resistance, corrosion resistance, etc. The casting industry is prone to many quality problems in the process of low-pressure casting, but the core factors that really affect its quality are roughly divided into three categories.
1. Reasonable die casting process
It is necessary to have a reasonable die-casting process, that is, according to the die-casting structure, weight and size, die-casting alloy characteristics and production conditions, select the appropriate parting surface, modeling and core making method, and reasonably set the casting rib, riser and gating system, so as to ensure the processing of high-quality low-pressure castings.
2. Design technology of die casting parts
During the design, in addition to determining the geometry and size of die castings according to the working conditions and metal material properties, the rationality of the design must also be considered from the perspective of die casting alloy and die casting process characteristics, that is, obvious size effect and solidification, shrinkage, stress and other problems, so as to avoid or reduce the occurrence of defects such as component segregation, deformation and cracking of die castings.
3. Quality of raw materials for low pressure casting
If the material used is unreasonable, the casting will have defects such as air hole, pinhole, slag inclusion and sand sticking. The appearance quality and internal quality of the die casting will be seriously scrapped.
It is also necessary to formulate reasonable die casting process operation procedures, improve the technical level of workers, and correctly implement the low-pressure casting procedures. If you want to make better die casting processing, you should pay more attention to the above three factors.
Editing: xyq